Your router suppports IGMP function? Is it enabled?

I have the same issue with my AV600.
IGMP proxy is enabled

no ethernet access to wireless router and nas disk through powerline connection.
Wirelessly i can access them.

My setup is:
ADSL Modem --> Powerline --> Wireless router connected to NAS --> powerline --> Desktop pc --> powerline.

IGMP proxy is enabled in wireless router.

I have not configured my network, router or nas other than "plug and play" so far.

Your description on setup is not clearly enough.
Your modem and router are connected by powerline devices or ethernet cable?
From router to NAS and from router to PC are both connected by powerline devices?

Hi Ada,

i will try to clear it out better here:

ADSL Modem connected to powerline nr.1
Wireless router has four LAN ports and connected in one of them there is a NAS server. The Wireless router is connected to powerline nr. 2 through WAN port.
Desktop PC gigabit ethernet card is connected to powerline nr. 3

With this setup i am unable to ping wireless router and NAS throug ethernet. I have wireless internet access to wireless router and nas with this setup.

Your PC (to modem) and your server (to router) are in different subnets then and I don't think they should be able to ping each other.

Try to test in this way.
modem----(WAN Port)Router（LAN Port）----PLC1-----PLC2（Server）
------PLC3（PC）